fix: add unknown action to MicrometerMetrics (#3038) #5921

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	2m 35s
sample_operators_tests (sample-operators/tomcat-operator)	3m 3s
sample_operators_tests (sample-operators/leader-election)	3m 20s
sample_operators_tests (sample-operators/webpage)	2m 57s
	11m 55s

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